JPH06296619A - Forceps - Google Patents

Abstract

PURPOSE:To prevent damage of a forceps member, its pivotally supporting part and a link, etc., even if immoderate force is applied to a driving member. CONSTITUTION:In the forceps consisting of a forceps part being freely openable and closeable in the tip part, an inserting part 2 provided with an operating part in the base end part, and a driving member 8 which is provided in this inserting part 2, moves forward and backward by an operation of the operating part and opens and closes the forceps part, the forceps part is constituted of a pair of a forceps members 4, 5 for turning with a pivotally supporting pin 13 as a supporting point. The rear end part of the forceps members 4, 5 and the tip part of the driving member 8 are connected by links 16a, 16b, and in a linkage member 14 linked integrally with the driving member 8, an abutting part 14c for abutting on the links 16a, 16b and regulating the turning amount of an opening operation of the forceps members 4, 5 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to forceps used for endoscopic surgery, for grasping or cutting tissue.

[0002]

As a forceps (scissors) for grasping or cutting a tissue, which is used for endoscopic surgery, it is disclosed in Japanese Patent Laid-Open No. 4-2.
Japanese Patent No. 46344 is known. This forceps is composed of a forceps part that is openable and closable at the tip part, a forceps body that has an operation part at the base end part, and a drive member that is provided in the forceps body and that moves forward and backward by operating the operation part to open and close the forceps part. It is configured.

The forceps portion is formed by a pair of forceps members which are rotatable around a fulcrum pin as a fulcrum, and a cam groove is provided at the rear end of the forceps member. Further, an engaging pin is provided in a projecting manner at the tip of the drive member that is driven to move back and forth by the operation portion, and the engaging pin engages with the cam groove, and the forceps member pivotally supports as the drive member moves forward and backward. It is designed to be opened and closed with a pin as a fulcrum.

7 to 9 are forceps (scissors) used for endoscopic surgery to grasp or cut tissue.
Indicates. FIG. 7 shows the entire forceps for an endoscope, and the forceps includes a forceps part 1, an insertion part 2 as a forceps body, and an operating part 3. The forceps portion 1 is composed of a pair of forceps members 4, 5 configured in a scissors shape and an opening / closing mechanism 6 for opening and closing the forceps members 4, 5. In addition, 3a is a high frequency power supply terminal provided in the operation unit 3, and is a high frequency ablation device (not shown).
Connected to.

As shown in FIGS. 8 and 9, the insertion portion 2 is composed of a tubular sheath 7 and a driving member 8 which is inserted into the sheath 7 so as to be movable back and forth and connected to the opening / closing mechanism 6. The operation unit 3 includes a pair of handles 9 a and 9 b that are rotatable around a pivot pin 9 as a fulcrum, and a connecting member 10 that is connected to the driving member 8.

This forceps is inserted into the abdominal cavity of the patient via a trawl or the like, and the operator opens and closes the handles 9a and 9b to open and close the forceps members 4 and 5 of the distal end portion 1, thereby organs, Can cut objects such as blood vessels and peritoneum, and when used as grasping forceps or peeling forceps,
By opening and closing the handles 9a and 9b, the forceps members 4 and 5 can be opened and closed to grip or peel the object.

Explaining the forceps part 1, a cylindrical holding member 12 is projectingly provided at the distal end of the sheath 7, and the holding member 1
Slots 12a are formed in the upper and lower portions of the second portion 2 along the axial direction.

Inside the slot 12a, rear ends of a pair of forceps members 4, 5 constituting the forceps part 1 are housed, and an intermediate portion of the forceps members 4, 5 is a pivot pin 1 as a pivot portion.
It is rotatably and pivotally supported by the holding member 12 by 3. Blade portions 4a, 5a are formed on the front end side of the forceps members 4, 5, and the rear end portions are biased in opposite directions in the vertical direction, and connecting pins 4b, 5b are projectingly provided at the end portions. There is.

A connecting member 14 which is provided integrally with the drive member 8 and which forms a part of the drive member is inserted inside the holding member 12 at the base end side so as to be movable back and forth in the axial direction. A common connecting pin 15 extends through the tip of the connecting member 14 in a direction orthogonal to the axial direction of the connecting member 14. Further, links 16a and 1 are provided on both ends of the common connecting pin 15, respectively.
One end of 6b is pivotally supported, and the other end thereof is pivotally supported by the connecting pins 4b and 5b of the forceps members 4 and 5 to form a four-bar linkage mechanism 17.

Therefore, by operating the handles 9a and 9b with fingers, the driving member 8 advances inside the sheath 7 and the connecting member 14 also moves to the distal end side. As the connecting member 14 advances, the four-bar linkage 17
Links 16a and 16b of the above-mentioned are rotated outwardly with the common connecting pin 15 as a fulcrum, and by the rotation of the links 16a and 16b, the forceps members 4 and 5 are rotated in a relative opening direction with the pivotal support pin 13 as a fulcrum. .

When the drive member 8 is retracted by the handles 9a and 9b, the connecting member 14 also moves to the rear end side, and the links 16a and 16b of the four-bar linkage mechanism 17 are moved inward with the common connecting pin 15 as a fulcrum. This link 1 rotated
By rotating 6a and 16b, the forceps members 4 and 5 rotate in the closing direction with the pivot pin 13 as a fulcrum.

When the forceps members 4 and 5 are opened,
When closed, part of the rear end of the forceps members 4, 5 and the link 1
A part of 6a, 16b comes into contact with the contact point 18 to provide a function as a stopper for restricting the opening degree and the closing degree.

[0013]

However, in the former forceps constructed as described above, the cam groove and the engagement pin are constantly slid when the tissue is cut or the treatment tool or the like is grasped. Since it is moving, it gradually wears out. As a result, the shape of both the cam groove and the engagement pin changes, and the positional relationship changes. This is a change in the fully open state, the fully closed state and the play. In short, the amount of opening becomes small in the fully open state, and cannot be completely closed in the fully closed state. Further, there is a problem that the play becomes large, and it becomes impossible to quickly change the operation from the open to the closed or from the closed to the open.

In the latter, when the forceps members 4 and 5 are opened and when they are closed, a part of the rear ends of the forceps members 4 and 5 and a part of the links 16a and 16b come into contact with each other. Since the opening and the closing degree are regulated by making contact with the link 16
The position of the stopper is determined by the shapes of a and 16b. Depending on the combination of the lengths of the links 16a and 16b, the links may pass the position where they should be stopped. As a result, the reversible movement of the forceps members 4 and 5 is hindered.

Further, the links 16a and 16b are brought into contact with each other to be integrated, and the force for closing the forceps members 4, 5 is all converted into a force for pulling the forceps members 4, 5. As a result, the pivot pin 13, which is a fulcrum of the forceps members 4 and 5, may be broken.

The present invention has been made in view of the above circumstances, and its purpose is to abut the abutting portion only at the limit point of the operation of the link mechanism to restrict the rotation range of the forceps member. An object of the present invention is to provide a forceps capable of preventing the link mechanism and the forceps member from being damaged.

[0017]

In order to achieve the above-mentioned object, the present invention provides a pair of forceps members which can be opened and closed at the distal end, a forceps main body having an operating portion at the proximal end, and the forceps main body. In a forceps including a drive member that is provided in the drive unit and that moves back and forth by operating the operation unit, and a link that opens and closes the forceps member in association with the forward and backward movement of the drive member, a forceps that abuts the drive member with the forceps member. This is because an abutting portion that restricts the opening operation of the member is provided.

When the operating member is operated to move the drive member forward, the pair of forceps members are opened via the link connected to the drive member, and the link abuts the abutting portion of the drive member when the forceps member is fully opened. The rotation range of the forceps member is regulated. Further, when the drive member is retracted, the pair of forceps members are closed via the link.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. However, the same components as those of the prior art will be designated by the same reference numerals and the description thereof will be omitted. 1 and 2 show a first embodiment,
1 shows the forceps members 4, 5 in a fully closed state, and FIG. 2 shows the forceps members 4,
5 shows a fully open state.

A connecting member 14 forming a part of the drive member 8 is axially advanceable and retractable at the distal end of the drive member 8 which is inserted into the sheath 7 so as to be advanceable and retractable. The tip portion 14a of the connecting member 14 has a flat shape, and
A pin hole 14b is formed in a.

A common connecting pin 15 penetrates through the pin hole 14b in a direction orthogonal to the axial direction of the connecting member 14.
Further, one ends of links 16a and 16b are pivotally supported at both ends of the common connecting pin 15, respectively, and the other ends thereof are pivotally supported at the connecting pins 4b and 5b of the forceps members 4 and 5, respectively.
The four-bar linkage mechanism 17 is configured.

On the base end side of the tip portion 14a of the connecting member 14, there is formed a contact portion 14c which is perpendicular to the flat surface of the tip portion 14a and is inclined with respect to the axial direction of the insertion portion 2. The contact portions 14c are provided on both sides corresponding to the links 16a and 16b.

Further, the rear end portion 14d of the connecting member 14 is formed in a cylindrical shape, and the width (height) of the front end portion 14a is larger than the diameter of the rear end portion 14d, and the rear end surface 14e protruding outward is formed. With the forceps members 4 and 5 closed, the bottom surface 12b of the slot 12a of the holding member 12 is in contact with the rear end surface 14e of the connecting member 14, and in this state, the rear end portions of the forceps members 4 and 5 are in contact. Keeps a constant distance from the links 16a and 16b and does not come into contact with them.

Therefore, by operating the handles 9a and 9b by putting fingers on them, the drive member 8 advances inside the sheath 7, and the connecting member 14 also moves to the distal end side. As the connecting member 14 advances, the four-bar linkage 17
Links 16a and 16b of the above-mentioned are rotated outward with the common connecting pin 15 as a fulcrum, and the rotation of the links 16a and 16b causes the forceps members 4 and 5 to rotate in a relative opening direction with the pivot support pin 13 as a fulcrum. .

When the links 16a, 16b rotate and come into contact with the contact portion 14c of the connecting member 14, the links 16a, 16b
The rotation amount of b is regulated, and the forceps members 4 and 5 are held in the fully opened state. That is, the contact portion 14c of the connecting member 14 contacts the links 16a and 16b and functions as a stopper.

When the driving member 8 is retracted by the handles 9a and 9b, the connecting member 14 also moves to the rear end side, and the links 16a and 16b of the four-bar linkage mechanism 17 are moved inward with the common connecting pin 15 as a fulcrum. This link 1 rotated
By rotating 6a and 16b, the forceps members 4 and 5 rotate in the closing direction with the pivot pin 13 as a fulcrum.

3 and 4 show a second embodiment, and the same components as those of the first embodiment are designated by the same reference numerals and their description is omitted. A contact portion 14f is provided on the front end surface of the front end portion 14a of the connecting member 14 in a direction orthogonal to the axial direction of the insertion portion 2. Further, at the base end portions of the forceps members 4 and 5, contact surfaces 4c and 5 that are inclined surfaces that are inclined with respect to the axial direction of the insertion portion 2 are provided.
c is formed, and the contact surfaces 4c, 5c are the forceps members 4, 5,
When it is in a fully opened state, it is in a direction orthogonal to the axial direction of the insertion portion 2 and faces the contact portion 14f.

Therefore, by operating the handles 9a and 9b by putting fingers on them, the driving member 8 advances inside the sheath 7, and the connecting member 14 also moves to the distal end side. As the connecting member 14 advances, the four-bar linkage 17
Links 16a and 16b of the above-mentioned are rotated outward with the common connecting pin 15 as a fulcrum, and the rotation of the links 16a and 16b causes the forceps members 4 and 5 to rotate in a relative opening direction with the pivot support pin 13 as a fulcrum. .

When the contact portion 14f of the connecting member 14 contacts the contact surfaces 4c, 5c of the forceps members 4, 5, the rotation amount of the links 16a, 16b is restricted, and the forceps members 4, 5 are fully opened. Retained. That is, the contact portion 14f of the connecting member 14 contacts the forceps members 4 and 5 and functions as a stopper.

FIGS. 5 and 6 show a third embodiment. The same components as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. A cylindrical holding member 12 is provided at the distal end of the sheath 7, and a slot 12a is formed in the upper and lower portions of the holding member 12 along the axial direction.

Rear ends of the pair of forceps members 4 and 5 are housed inside the slot 12a, and linear cam grooves 4d and 5d are provided at the rear ends of the forceps members 4 and 5. . An intermediate portion of the forceps members 4 and 5 is rotatably supported on the holding member 12 by a support pin 13 as a support member.

The tip portion 14a of the connecting member 14 is formed flat and is interposed between the step portions 4x, 5x of the forceps members 4, 5. A pin hole 18 is formed in the tip portion 14a of the connecting member 14.
And the cam grooves 4d, 5d are formed in the pin hole 18.
An engaging pin 19 that engages with is inserted.

Protrusions 4e and 5e and recesses 4f and 5f are formed on the rear sides of the pivotal support portions of the forceps members 4 and 5, respectively. The projections 4e and 5e have horizontal surfaces 4g and 5g and an inclined surface 4.
h and 5h, and the horizontal surfaces 4 are provided in the recesses 4f and 5f.
j, 5j are formed. And horizontal planes 4g, 4j
Are connected in the same plane.

In the state of FIG. 5, horizontal planes 4g, 4j
And the horizontal planes 5g, 5j are in contact with each other, and the forceps members 4, 5 function as stoppers so as not to be closed further. At this time, since the engagement pin 19 does not reach the end of the cam grooves 4d and 5d on the operation portion side, the engagement pin 19 and the cam groove 4d,
Even if 5d is worn, by further moving the drive member 8, the projections 4e, 5e and the recesses 4f, 5f can be brought into contact with each other, and the forceps members 4, 5 can be closed to a predetermined position. .

Therefore, by operating the handles 9a and 9b by putting fingers on them, the driving member 8 advances in the sheath 7 and the connecting member 14 also moves to the distal end side. As the connecting member 14 advances, the engaging pin 19 also moves to the tip side, and the engaging pin 19 moves in the cam grooves 4d and 5d, so that the forceps members 4 and 5 use the pivot pin 13 as a fulcrum. Rotate relatively in the opening direction.

Since the tip portion 14a of the connecting member 14 advances between the step portions 4x and 5x of the forceps members 4 and 5, the tip portion 14a is prevented from rotating around the axis of the insertion portion 2,
The engagement pin 19 is prevented from being engaged with the cam grooves 4d and 5d while being inclined.

When the connecting member 14 moves to the tip side and the forceps members 4 and 5 are opened, the horizontal planes 4g and 4j which are in contact with each other are separated from the horizontal planes 5g and 5j, and finally, as shown in FIG.
The inclined surfaces 4h and 5k and 4k and 5h of the forceps members 4 and 5
Contact each other. In this state, the forceps members 4 and 5 can no longer be opened, and the protrusions 4e and 5e and the recesses 4f and 5f function as stoppers on the opening side.

At this time, the engaging pin 19 is engaged with the cam grooves 4d, 5
Even if the engagement pin 19 and the cam grooves 4d and 5d are worn, the drive member 8 is further moved to bring the projections 4e and 5e into contact with the recesses 4f and 5f, because the end of the front end side of d is not reached. The forceps members 4 and 5 can be opened to a predetermined position.

[0039]

As described above, according to the present invention, the forceps portion is composed of a pair of forceps members that rotate about the pivotal support portion, and the driving member is brought into contact with the forceps member to open the forceps member. By providing a contact part that regulates
Even if an unreasonable force is applied to the driving member, it is possible to prevent the forceps member, its pivot portion, the link, and the like from being damaged.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a forceps member according to a first embodiment of the present invention with a forceps member in a closed state.

FIG. 2 is a vertical cross-sectional side view of the forceps of the same embodiment with the forceps member open.

FIG. 3 is a vertical cross-sectional side view of a forceps member of a forceps according to a second embodiment of the present invention in a closed state.

FIG. 4 is a vertical cross-sectional side view of the forceps of the same embodiment with the forceps member open.

FIG. 5 is a vertical cross-sectional side view of a forceps member according to a third embodiment of the present invention in a closed state.

FIG. 6 is a vertical cross-sectional side view of the forceps of the same embodiment with the forceps member open.

FIG. 7 is a side view showing the entire conventional forceps.

FIG. 8 is a vertical cross-sectional side view of a forceps member of the conventional forceps in a closed state.

FIG. 9 is a vertical cross-sectional side view of a forceps member of the conventional forceps in an open state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Forceps part 2 ... Insertion part 3 ... Operation part 4, 5 ... Forceps member 8 ... Driving member 13 ... Pivoting pin 14 ... Coupling member 14c ... Contact part 16a, 16b ... Link

Claims (1)

[Claims] 1. A pair of forceps members which are openable and closable at a distal end portion thereof, a forceps main body having an operating portion at a proximal end portion thereof, and a drive which is provided in the forceps main body and moves forward and backward by opening and closing the forceps member. A forceps comprising a member, wherein the drive member is provided with an abutting portion that abuts against the forceps member and restricts an opening operation of the forceps member.